Fusion Bombs

Thermonuclear, fusion, or hydrogen bombs explode with enormous power
using uncontrolled self-sustaining chain fusion reactions.
Deuterium and tritium, under extremely high temperatures, form
helium providing the energy.
D + T ®4He + n
In principle, a mixture of D, T and 6Li heated to very
high temperature and confined to a high density will start a chain
fusion reaction, liberating an enormous amount of energy.

In a thermonuclear bomb, the explosive process begins with the
detonation of what is called the primary stage. This consists
of a relatively small quantity of conventional explosives, its
detonation brings together enough fissionable uranium to create a
fission chain reaction, which in turn produces another explosion
and a temperature of several million degrees. When the temperature
of the mixture reaches 10,000,000 K, fusion reactions take place.

Fusion causes the temperature to rise, and neutrons released in fusion
causes further fission of 238U, that releases more
energy and radioactive fallout.

In the design of thermonuclear bombs, the neutrons released in fusion
are also used to generate more tritium by the reactions: